Zum Inhalt springen

Diese Anleitung gibt es noch nicht auf Deutsch – wir zeigen dir die englische Originalversion.

How to Do CPR on an Adult: Step-by-Step Emergency Guide

If an adult is unresponsive and not breathing normally, call your emergency number, put the phone on speaker and send someone for a defibrillator (AED). Push hard and fast in the centre of the chest, 5–6 cm deep at 100–120 compressions a minute, and don’t stop. If you’re trained, give 2 rescue breaths after every 30 compressions. Use the AED as soon as it arrives and follow its voice instructions.

Updated
Time
10 minutes
Difficulty
Medium

By Published Oct 9, 2026

Quick answer

  1. 1 Check it’s safe, then shout and tap the person’s shoulders.
  2. 2 If they don’t respond, open the airway and check breathing for up to 10 seconds.
  3. 3 If they’re not breathing normally, call emergency services on speaker and send for an AED.
  4. 4 Place the heel of your hand in the centre of the chest, other hand on top.
  5. 5 Push down 5–6 cm, 100–120 times a minute, letting the chest come back up each time.
  6. 6 If trained, give 2 rescue breaths after every 30 compressions.
  7. 7 Switch on the AED when it arrives and follow its instructions.
  8. 8 Keep going until help takes over or the person starts breathing normally.
On this page
  1. Before you start
  2. Check the person
  3. Call for help and get a defibrillator
  4. Give chest compressions
  5. Add rescue breaths (if you’re trained)
  6. Use a defibrillator (AED)
  7. When to stop
  8. Troubleshooting
  9. Frequently asked questions

Before you start

  • A phone to call emergency services
  • An automated external defibrillator (AED), if one is nearby

Method 1 Check the person

  1. Step 1: Make sure it’s safe

    Check for danger such as traffic, fire, electricity or water before you approach.

  2. Step 2: Check for a response

    Kneel beside them, tap their shoulders firmly and shout, “Are you all right?”

  3. Step 3: Open the airway

    If there’s no response, place one hand on their forehead and gently tilt the head back, then lift the chin with two fingers.

  4. Step 4: Check for breathing

    Look, listen and feel for normal breathing for no more than 10 seconds. Occasional gasps are not normal breathing; treat them as no breathing.

Method 2 Call for help and get a defibrillator

  1. Step 1: Call emergency services

    If they’re not breathing normally, call your emergency number and say the person is unresponsive and not breathing. Use speakerphone so your hands are free.

  2. Step 2: Send for an AED

    If someone is with you, send them to find a public-access defibrillator (AED); they are often in shops, stations, gyms and offices. The call handler can tell you where the nearest one is. Don’t leave the person to look for one yourself if you’re alone.

Method 3 Give chest compressions

  1. Step 1: Position your hands

    Kneel by their side. Place the heel of one hand in the centre of the chest (on the lower half of the breastbone), put your other hand on top and interlock your fingers.

  2. Step 2: Position your body

    Lean over so your shoulders are directly above your hands and keep your arms straight.

  3. Step 3: Push hard and fast

    Press straight down 5–6 cm (about 2–2.4 inches), at a rate of 100–120 compressions a minute, roughly the beat of the song “Stayin’ Alive”.

  4. Step 4: Let the chest come back up

    Release the pressure fully after each compression without lifting your hands off the chest.

  5. Step 5: Keep going

    Don’t stop except to let an AED analyse. If someone else can help, swap every 2 minutes, keeping the pause as short as possible, because CPR is tiring.

Method 4 Add rescue breaths (if you’re trained)

  1. Step 1: Give 30 compressions

    Count 30 chest compressions.

  2. Step 2: Give 2 breaths

    Tilt the head back and lift the chin, pinch the nose, seal your mouth over theirs and blow steadily for about 1 second until the chest rises. Repeat once.

  3. Step 3: Continue 30:2

    Return to 30 compressions immediately. If you’re not trained or not willing to give breaths, hands-only CPR (continuous compressions) is far better than nothing.

Method 5 Use a defibrillator (AED)

You can’t harm someone with an AED: it will only shock if the heart rhythm needs it.

  1. Step 1: Switch it on

    Open the case and switch it on. It will give clear spoken instructions. Keep doing compressions while someone else prepares it.

  2. Step 2: Attach the pads

    Remove or cut clothing from the chest, wipe the skin dry, and stick the pads where the pictures show: one below the right collarbone, one on the left side below the armpit.

  3. Step 3: Stand clear

    When it says it is analysing, make sure no one touches the person. If it advises a shock, check everyone is clear and press the shock button if asked (some AEDs shock automatically).

  4. Step 4: Restart CPR straight away

    Continue compressions as soon as the AED tells you to, and follow its prompts until help arrives.

Method 6 When to stop

  1. Step 1: Help takes over

    Keep going until paramedics or another trained person take over.

  2. Step 2: They show signs of life

    Stop if they start breathing normally, open their eyes, cough or move purposefully. Put them in the recovery position (on their side, top leg bent, head tilted back) and keep checking their breathing.

  3. Step 3: You’re exhausted or unsafe

    Stop only if you physically can’t continue or the scene becomes dangerous.

Troubleshooting

I’m afraid of hurting them

Ribs sometimes crack during effective CPR. That’s far less serious than the alternative: without CPR, someone in cardiac arrest will die.

I’m not sure if they’re breathing

If in doubt, start CPR. Gasping or irregular breaths are not normal breathing.

They vomit

Turn them onto their side, clear the mouth, then roll them back and continue CPR.

Frequently asked questions

Is hands-only CPR effective?

Yes. For adults, continuous chest compressions keep blood flowing to the brain and are much better than doing nothing.

Can I get in trouble for giving CPR?

Many countries have laws protecting people who help in good faith. The bigger risk is doing nothing.

How deep should compressions be?

5–6 cm (about 2–2.4 inches) for an adult, at 100–120 per minute.

Summary

If an adult is unresponsive and not breathing normally, call emergency services on speaker and send for an AED. Push hard and fast in the centre of the chest, 5–6 cm deep at 100–120 per minute, adding 2 breaths every 30 compressions if trained. Use the AED as soon as it arrives and keep going until help takes over. Book a first aid course to practise.

Written by

Dr. David Hoza

Medical Doctor (MD, MSc Radiology)

Dr. David Hoza is a Medical Doctor (MD) with a Master of Science in Radiology. He reviews OnlineHow’s health and wellness guides.